I got FBO support finally working on my 5200. The moral of the story is to RTFS
. If I had bothered to read the ARB_texture_rectangle spec, I would've noticed that UV coordinates are [0..w], [0..h] and not
[0..1], [0..1]. Damn! The second moral of the story is to always
check for npow2 support before assuming you have it "just because" you're on OpenGL 2.0.
I ended up finding it on the GPGPU FAQ
after many frustrated googles -- the code itself was fine but the example was broken because it was using the wrong texture coordinates.
In any event, this works now, and the FBO example is quite attractive. Woo woo! This party train keeps marching on.